What's the difference between operation and surgery?
Today I called a VET to give my little cat to do the de-sexing operation. I've used the word "operation", but she kept saying surgery. I want to know are they two in big differences?

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The term operation has several meanings: a general action, business operation, flight operation and so on.  Surgery is the branch of medicine concerned with diagnosis and treatment of injuries, pathological conditions by means operative procedures. Surgery operation is on of these procedures, it may be simply called "surgery".

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not really...when we say operation we mean_surgical operation_like a botox!!!
but with the word syrgery we mean_the medical science of the surgery.........!!!!!!!!!!!!!!!!!!!!

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an operation can mean manny things like .. a job that needs to be done and so on .. but surgery is when the cut you open to fix a problem. 
i hope that helps :)! 
good luck!
~nicamamii~